Income tax or Gst

GST registration: If it's own e-commerce platform through which your client is supplying products/services, then GST registration is compulsory irrespective of whatever is the turnover value.

As the client's previous year turnover doesn't seem to exceed limit prescribed u/s 44AB, TDS need not be deducted on the payments made to the model. But ensure that the payments are not in cash mode.